At the feet of the mountain were built the tombs of the Kings, and hard by upon a hill was Armenelos, fairest of cities, and there stood the tower and the citadel that was raised by Elros son of Eärendil, whom the Valar appointed to be the first King of the Dúnedain.

At length... [Aldarion and Erendis] rode back at last to Armenelos; for there by the King's wish his Heir would dwell, and a house was prepared for them amidst a garden of trees.

Unfinished Tales, Part 2, Ch 2, Aldarion and Erendis

And the tree grew and blossomed in the courts of the King in Armenelos; Nimloth it was named..., and the shadows of night it filled with its fragrance.

The Silmarillion, Akallabêth

But Sauron caused to be built upon the hill in the midst of the city of the Númenóreans, Armenelos the Golden, a mighty temple....

The Silmarillion, Akallabêth

The chief and most ancient road suitable for wheels, ran from the greatest port, Rómenna in the east, to the royal city of Armenelos, and thence on to the Valley of the Tombs and the Meneltarma; and this road was early extended to Ondosto within the borders of the Forostar, and thence to Andúnië in the west.